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Valvole di regolazione pressione

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TYPE DA - TYPE DAW

DA - DAW

Pressure control valves type DA - DAW are pilot operated pressure shut-off valves. They are used to switch a pump flow over to unpressurised by-pass as soon as the accumulator loading pressure is reached. Further applications for the valve are in systems that have high and low pressure pumps. In this case the low pressure pump is switched to unpressurised by-pass as soon as the set high pressure is reached. Pressure shut-off valves basically consist of the main valve with the main spool assembly, pilot valve with pressure adjustment element and check valve. In size 10 valves, the check valve is built into the main valve. In valve sizes 25 and 32 the check valve is built into a separate plate installed under the main valve.

TYPE DA - TYPE DAW (New series)

DA - DAW

Pressure control valves type DA - DAW are pilot operated pressure shut-off valves. They are used to switch a pump flow over to unpressurised by-pass as soon as the accumulator loading pressure is reached. Further applications for the valve are in systems that have high and low pressure pumps. In this case the low pressure pump is switched to unpressurised by-pass as soon as the set high pressure is reached. Pressure shut-off valves basically consist of the main valve with the main spool assembly, pilot valve with pressure adjustment element and check valve. In size 10 valves, the check valve is built into the main valve. In valve sizes 25 and 32 the check valve is built into a separate plate installed under the main valve.

TYPE DB - TYPE DBW

DB - DBW

Types DB and DBW pressure valves are pilot operated pressure relief valves. They are used for the limitation (DB) or limitation and solenoid actuated unloading (DBW) of the control pressure. The pressure relief valves (DB) consist mainly of the main valve with main spool assembly and pilot operated valve with pressure adjustment element.

TYPE DB - TYPE DBW (New series)

DB - DBW

Types DB and DBW pressure valves are pilot operated pressure relief valves. They are used for the limitation (DB) or limitation and solenoid actuated unloading (DBW) of the control pressure. The pressure relief valves (DB) consist mainly of the main valve with main spool assembly and pilot operated valve with pressure adjustment element.

TYPE DB3U

DB3U

Types DB3U pressure valves are pilot operated pressure relief valves. They are used for the limitation of the operating pressure, and they may be switched over to different (2 or 3 pressure stage) by solenoids actuated. The pressure relief valves consist mainly of the main valve 4/3, 4/1-Directional control valve (Type WE5) and three pilot valves. In the de-energized condition the pressure in port A is set by pilot valve. The pressure present in port A acts on the main spool. At the same time pressure is applied via the control lines, which are fitted with orifices, on the spring loaded side of the main spool and at the poppet in the pilot control valve. If the pressure in port A exceeds the value set at the spring, the poppet opens against the spring. The signal for this comes internally via the control lines and from port A. The pressure fluid on the spring loaded side of the main spool now flows via the control line, poppet into the spring chamber. In type DB3U it flows internally via the control line to tank, or in type DB3U externally via the port Y. Due to the orifices a pressure drop occurs at the main spool, the connection from port A to port B is open. Now the pressure fluid flows from port A to port B while maintaining the valve set operating pressure.

TYPE DBD

DBD
The DBD pressure relief valves are direct operated poppet valves. They are used to limit the pressure in a hydraulic system. The valves mainly consist of sleeve, spring,
poppet with damping spool (pressure stages 2.5 to 40 MPa) or ball (pressure stage 63 MPa) and adjustment element. The setting of the system pressure is infinitely variable via the adjustment element. The spring pushes the poppet onto the seat. The P channel is connected to the system. The pressure present in the system is applied to the poppet
area (or ball). If the pressure in channel P rises above the valve set at the spring, the poppet opens against the spring. Now pressure fluid flows form channel P into channel T. The stroke of the poppet is limited by a pin. In order to maintain a good pressure settings over the entire pressure range the pressure range is split into 7 pressure stages. One pressure stage corresponds to a certain spring for a maximum operating pressure which may be set with it.

TYPE DBK

DBK

Pressure relief valves type DBK are pilot operated pressure relief valves for installation in cartridge. They are used to limit the pressure in a hydraulic system. Setting of the system pressure is via adjustment element. At rest, the valves are closed. Pressure in port A acts on the spool. At the same time, pressure is passed through orifice on to the spring loaded side of the spool and through orifice to the pilot poppet. If the pressure in port A rises above the value set at spring, the pilot poppet opens. Fluid can now flow from the spring loaded side of spool, orifice, and channel into port Y. The resulting pressure drop moves spool causing this to open the connection from A to B, while the pressure set at spring is maintained. Pilot oil return from the two spring chambers is taken externally via port Y.

TYPE DBT - TYPE DBWT

DBT DBWT

Types DBT and DBWT remote control pressure valves are pilot operated pressure relief valves. Type DBT is apply to remote control the pressure of system.

TYPE DC 10B

DC 10B

The valves consist basically of the housing, direct operated poppet valve, and check valve. Check-Q-meters are used in hydraulic systems to prevent negative loads causing hydraulic cylinders or motors "running away",They may also act as anti-burst valves.

TYPE DR

DR

Pressure valves type DR are pilot operated pressure reducing valves, which are controlled from the secondary circuit. They basically consist of main valve with main spool insert and pilot valve with pressure adjustment element. At rest, the valves are open, fluid can freely pass from port B to port A via the main spool. Pressure present in port A acts upon the bottom side of the main spool. At the same time there is pressure acting on the poppet in the pilot valve via the orifice on the spring-loaded side of the main piston and via the port. Same it is acting on the poppet via the orifice, control line, and orifice. According to setting of spring, pressure builds up in front of the poppet, in port and in spring chamber, holding the control spool in the open position. Fluid can freely flow from port B to port A via main spool, until the pressure in port A exceeds the value set at spring and opens the poppet. The control piston moves to closing position. The desired reduced pressure is achieved, when a balance between the pressure in port A and the pressure set at spring is reached. Pilot oil drain from spring chamber to tank takes place externally via line. Free return flow from port A to B can be achieved by installing an optional check valve. A pressure gauge connection allows the reduced pressure in port A to be monitored.

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